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package angry1980.utils;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;

import java.util.stream.Collector;

public class ImmutableCollectors {

    public static  Collector, ImmutableList> toList() {
        return Collector.of(
                ImmutableList.Builder::new,
                ImmutableList.Builder::add,
                (b1, b2) -> b1.addAll(b2.build()),
                (builder) -> builder.build()
        );
    }

    public static  Collector, ImmutableSet> toSet() {
        return Collector.of(
                ImmutableSet.Builder::new,
                ImmutableSet.Builder::add,
                (b1, b2) -> b1.addAll(b2.build()),
                (builder) -> builder.build()
        );
    }

}